The History Channel

The U.S. Bullion Depository, better known as Fort Knox, is home of the United States Army and one of the world's most top secret fortresses. Hidden deep inside the vault is an estimated $73 billion dollars in gold. Almost all information about it is classified. Through interviews with eyewitnesses, rare photos and rarely seen films, we will construct a picture of what the building might look like. Hear testimony of those journalists and congressmen who were among the select few invited inside in 1974. Discover the history and secrets behind the Army's tank warfare and the classified military technologies it will use to fight the wars of the future.

From the prehistoric drawings through the Roswell incident, reports of strange and unexplainable sightings in the skies have become part of an unofficial historic record. With the proliferation of video and photo technology in the modern era, reports of these events--along with visual evidence--have only increased. 95% of UFO sightings are false, resulting either from misidentification or deliberate hoaxes. But the other 5% cannot be dismissed. Based on the newly published book "UFO's: Generals, Pilots and Government Officials Go On the Record," this two-hour special explores sightings that are supported by numerous creditable sources, from Air Force and commercial pilots, FAA officials, investigators, military Generals and NASA officials as well as hard data: photos, film, radar and audio recordings. This evidence presents a startling look at the very real possibility of alien visitation.

Best-selling author Brad Meltzer and his team dig into one of the Civil War's most enduring legends: that millions of dollars' worth of missing gold and silver from the Confederate treasury are still buried in secret hiding places across America. According the legend, the only way to find that buried treasure is to decode cryptic signs and symbols left behind by a shadowy Confederate group known as the Knights of the Golden Circle. Brad and the Decoded team join veteran treasure hunter Bob Brewer, whose lifetime effort to understand the KGC's secret code paid off when he uncovered a small fortune in buried Confederate coins. Bob soon shows just how well he understands those codes as he and the team follow KGC clues to the location of another possible treasure trove.

On November 24, 1963, a stunned America struggled to accept the assassination of President John F. Kennedy two days earlier. As tens of millions stared at their televisions that Sunday morning, they witnessed TV's first live murder--the killing of assassination suspect Lee Harvey Oswald by Dallas strip-club owner Jack Ruby. What was seen for 47 hours as an isolated tragedy became one of the most notable suspected conspiracies in US history. And while the Warren Commission claimed that Oswald and Ruby both acted alone, the House Select Committee on Assassinations concluded in 1979 that JFK's murder most likely resulted from a conspiracy. Now, a new development has shaken both sides of the conspiracy controversy. Recently revealed evidence suggests the CIA may have been tracking Oswald and indicates a possible link among anti-Castro Cubans, Carlos Marcello, Ruby, Oswald, and the CIA.

On June 5, 1968, just after midnight, Robert F. Kennedy was fatally wounded in the pantry of the Ambassador Hotel in Los Angeles following his win in that night's California presidential primary. The armed assailant was taken into custody that night and later identified as a 25-year-old Palestinian immigrant, Sirhan Bishara Sirhan. He remains in prison to this day for the assassination of Senator Kennedy. More than 35 years later, questions in the Robert Kennedy murder remain: Was there a second gunman in the pantry? Is there evidence of a police cover-up? What was Sirhan Sirhan's mental state that night and what drove him to assassinate RFK?

Robots that think, move like humans and fight our wars--Real Terminators--may now be possible. At leading universities and covert government labs, robots are now being developed in man's image; cyborgs with superhuman strength, machines that may eventually be able to make decisions, even kill on their own. But will these very robots designed to protect us ultimately turn on their masters?

The power of true invisibility may now be possible. This episode investigates classified reports that the British military recently tested an invisible battle tank, examines the scientific breakthroughs that may soon give us all the power of invisibility, and witnesses a remarkable demonstration of an invisibility cloak that makes a man vanish.

Best-selling author Brad Meltzer and his Decoded team examine claims that John Wilkes Booth actually escaped to freedom after murdering President Abraham Lincoln in 1865. The "official" version of events says federal agents cornered Booth and killed him just days after the assassination. But Brad and the team uncover glaring inconsistencies in that 150-year-old account: Why did the authorities hide Booth's body from public view? Why was Booth autopsy's conducted in complete secrecy in the cramped confines of an ironclad gunboat? Searching for answers to these and other troubling questions, the team finds startling evidence that strongly suggests Booth may indeed have lived into old age without ever facing punishment for his crime.

It has been said that necessity is the mother of all invention--but that is not always the case. Some strange machines are built for sheer spectacle, some a glimpse into the future or even the past, while others are just plain...Weird. Take a look at machines that specialize in high functionality and low practicality, prompting two very important questions: What is it and...how do I get one? An Alaskan navigates the Juneau waters with his homemade submarine. A California company shocks local beach bums with their fully submersible "shark boats." We'll also meet a bicep-curling robot that's built to save lives; scale a mountain with a 21st century Batman-esque rope ascender; witness an engineered, forty-foot vortex of fire known as the Flame Tornado; and hit the backcountry trails with a snowboard-motorcycle hybrid inspired by a shopping cart.

U.S. soldiers today face enormous challenges, often stationed in desolate locations behind enemy lines. Keeping them protected is priority number one--and the military is making enormous leaps in devising a wide array of high-tech equipment to protect today's soldier. From elaborate elite training facilities, to GPS-guided air drops, to revolutionary high-tech tents and fire-retardant uniforms, we explore the science and technology of building, operating and protecting a base in a warzone.

Tens of millions of them all over the world--soda and snack machines, parking meters and payphones, video games and vending machines... and they all use coins--but for how long? Examine the historic one-armed bandits and the 21st century, cutting edge, computerized slot machines that occupy Vegas casinos and get an exclusive look at their inner workings in a never-before-seen factory in Reno, Nevada. Search out some of the wackiest, strangest vending machines on the planet that sell everything from bottles of wine to dog washes. Get a close-up look at the famous binoculars located at popular tourist sites around the world, as well as a unique company that collects and cleans the coins thrown into fountains for good luck. But it all starts and ends in the historic halls of the U.S. Mint, where coins are made and destroyed. Will coins one day become obsolete?

They are the largest moving objects on land--and one of the most powerful machines ever constructed...Trains. With over 100 cars joined together, and stretching over a mile in length, they can move tons of materials at speeds in excess of 70 miles per hour. They ride on almost 100,000 miles of steel rails that literally crisscross the nation. To service this vast system, an equally huge complex of railroad boneyards has emerged. Imaginative entrepreneurs have found new and innovative uses for every single component of the railroads--from tracks and ties--to the trains themselves. Though most of these great iron horses will ultimately be ripped and torn apart for scrapping, some will be grandly restored to live on in other roles.

Informational programming.

Informational programming.

Informational programming.

Informational programming.

The boneyard becomes the last stop for millions of autos every year due to old age, obsolescence or lack of parts. Most of these old road warriors are shredded into scrap and recycled, but some are treasured as priceless engineering marvels. Discover the unusual after-life of these retired vehicles and take the fascinating ride to and back from the boneyard.

On November 24, 1963, a stunned America struggled to accept the assassination of President John F. Kennedy two days earlier. As tens of millions stared at their televisions that Sunday morning, they witnessed TV's first live murder--the killing of assassination suspect Lee Harvey Oswald by Dallas strip-club owner Jack Ruby. What was seen for 47 hours as an isolated tragedy became one of the most notable suspected conspiracies in US history. And while the Warren Commission claimed that Oswald and Ruby both acted alone, the House Select Committee on Assassinations concluded in 1979 that JFK's murder most likely resulted from a conspiracy. Now, a new development has shaken both sides of the conspiracy controversy. Recently revealed evidence suggests the CIA may have been tracking Oswald and indicates a possible link among anti-Castro Cubans, Carlos Marcello, Ruby, Oswald, and the CIA.

On June 5, 1968, just after midnight, Robert F. Kennedy was fatally wounded in the pantry of the Ambassador Hotel in Los Angeles following his win in that night's California presidential primary. The armed assailant was taken into custody that night and later identified as a 25-year-old Palestinian immigrant, Sirhan Bishara Sirhan. He remains in prison to this day for the assassination of Senator Kennedy. More than 35 years later, questions in the Robert Kennedy murder remain: Was there a second gunman in the pantry? Is there evidence of a police cover-up? What was Sirhan Sirhan's mental state that night and what drove him to assassinate RFK?

Robots that think, move like humans and fight our wars--Real Terminators--may now be possible. At leading universities and covert government labs, robots are now being developed in man's image; cyborgs with superhuman strength, machines that may eventually be able to make decisions, even kill on their own. But will these very robots designed to protect us ultimately turn on their masters?

The power of true invisibility may now be possible. This episode investigates classified reports that the British military recently tested an invisible battle tank, examines the scientific breakthroughs that may soon give us all the power of invisibility, and witnesses a remarkable demonstration of an invisibility cloak that makes a man vanish.